Finding the Fourth Proportional to 9,212.65, 12,709.85 and 5,669.71

Step by Step Solution

1. Step 1: Write the proportion equation
   9,212.65 : 12,709.85 = 5,669.71 : x
2. Step 2: Convert to fraction form
   9,212.65/12,709.85 = 5,669.71/x
3. Step 3: Cross multiply
   9,212.65x = 12,709.85 × 5,669.71
4. Step 4: Simplify right side
   9,212.65x = 72,061,103.52
5. Step 5: Solve for x
   x = 72,061,103.52/9,212.65
6. Step 6: Final answer
   x = 7,821.98